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I have a problem with a species growing in a heathland at the top of a very exposed sea cliff. It had been provisionally identified as Trapeliopsis granulosa, but I don’t think it’s that species. There are no orange colorations, and it’s probably not Trapeliopsis pseudogranulosa. Furthermore, it might not be a Trapeliopsis… Do you have any ideas? Thanks in advance.
Alain
Alain Yes Pd+ red is wrong for any C+ red
Trapeliopsisand it looks odd for Trapeliopsis granulosa. The spot tests match Micarea leprosula, although that is not usually that pale, but looks a better match Trapeliopsis granulosapossibly? Neil
The C+ orange reaction indicates xanthones and suggests Lecidella of Lecanora s. lat., but the PD+ red (?fumarprotocetraric acid) is unusual and rules out most possibilities. Could it be a really weird L. meiococca, which reportedly sometimes grows on ‘decaying Armeria tufts’ and can have a variable chemistry. Sorry, I made a mistake: this species is C+ orange, KC+ red-orange, K+/- yellow, P-. Due to the presence of a jelly, I think it is a maritime form of Trapeliopsis pseudogranulosarather than Trapeliopsis granulosa? Your opinion?
Alain
[attachment=0]Trapeliopsis_granulosa_Cf Cap_de_la_Chevre_S12.jpg[/attachment] As Alan indicates, the orange C+ reaction (xanthones) does not allow us to consider a Trapeliopsis. I therefore think that it is a terricolous/saxicolous form of Lecanora alboflavida(to be described). Alain
Yes looks a good match for Lecanora alboflavida, this is probbaly locally widespread but overlooked on rock some oceanic areas in Britain, but I have never seen it terricolous. A conformation would be very strong UV+ orange fluorescence from the thallus. Neil
Many thanks Neil and Alan, orange fluorescence OK for Lecanora alboflavidamaritime soil form. Alain
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